Agate slices are only measured by length. The best agate sizes for DRINK COASTERS are #3-#4-#5

#3 is a small coaster - #4 is our standard size coaster - #5 is a larger coaster / easy to make your own Gilded Agate Coasters.Agates will come in many shapes so if you prefer a round agate slice please use the cherry picking service ( request Round , No hole )